Propellerhead Reason - 4.0 Manual de Operações descarregar pdf (Página 294)

DR. REX LOOP PLAYER

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• The output of the two LFOs are never actually heard. Instead they are used for

modulating various parameters.

The most typical application of an LFO is to modulate the pitch of a (sound generat-

ing) oscillator or sample, to produce vibrato. In the Dr.Rex device, you can also use

the LFO to modulate the filter frequency or panning.

Waveform

LFO 1 allows you to select different waveforms for modulating parameters. These are,

from top to bottom:

Destination

The available LFO Destinations are as follows:

Sync

By clicking this button you activate/deactivate LFO sync. The frequency of the LFO

will then be synchronized to the song tempo, in one of 16 possible time divisions.

When sync is activated, the Rate knob (see below) is used for setting the desired time

division.

Turn the knob and check the tooltip for an indication of the time division.

Rate

The Rate knob controls the LFO’s frequency. Turn clockwise for a faster modulation

rate.

Amount

This parameter determines to what degree the selected parameter destination will be

affected by the LFO 1, i.e. the amount of vibrato, filter wah or auto-panning.

Velocity Control

Velocity is usually used to control various parameters according to how hard or soft

you play notes on your keyboard. A REX file does not contain velocity values on its

own. And when you create sequencer track data by applying the “To Track” function,

all velocities are set to a default value of “64”. As velocity information is meant to re-

flect variation, having them all set to the same value is not meaningful if you wish to ve-

locity control Dr.Rex parameters.

There are basically two ways you can apply “meaningful” velocity values to REX files:

• After creating track data, you can edit velocity values in the Velocity Lane in the se-

quencer.

• You can play slices in real time on your keyboard. The resulting data will have ve-

locity values reflecting how the notes were struck when you played.

When velocity values have been adjusted, you can control how much the various pa-

rameters will be affected by velocity. The velocity sensitivity amount can be set to ei-

ther positive or negative values, with the center position representing no velocity

control.

The following parameters can be velocity controlled:

Waveform

Description

Triangle This is a smooth waveform, suitable for normal vibrato.

Inverted

Sawtooth

This produces a “ramp up” cycle. If set to control pitch (frequency),

the pitch would sweep up to a set point (governed by the Amount

setting), after which the cycle immediately starts over.

Sawtooth This produces a “ramp down” cycle, the same as above but inverted.

Square This produces cycles that abruptly changes between two values, us-

able for trills etc.

Random Produces random stepped modulation to the destination. Some vin-

tage analog synths called this feature “sample & hold”.

Soft Random The same as above, but with smooth modulation.

Destination

Description

Osc Selecting this makes LFO control the pitch (frequency) of the REX

file.

Filter Selecting this makes the LFO control the filter frequency.

Pan Selecting this makes the LFO modulate the pan position of the REX

file, i.e. it will move the sound from left to right in the stereo field.

Parameter

Description

Amp This let’s you velocity control the overall volume of the file. If a posi-

tive value is set, the volume will increase with higher velocity values.

F. Env This sets velocity control for the Filter Envelope Amount parameter.

A positive value will increase the envelope amount with higher veloc-

ity values. Negative values invert this relationship.

F. Decay This sets velocity control for the Filter Envelope Decay parameter. A

positive value will increase the Decay time with higher velocity val-

ues. Negative values invert this relationship.

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